| 摘要 |
<p>A motorised drive unit for adjusting a microscope table. The drive unit comprises a drive shaft 3 on which is arranged a rolling ring transmission 5, which comprises a carrier and three rings 6 which contact and surround the shaft. The rings are inclined to the axis, with the outer rings having inclinations parallel to one another. The inner ring is inclined at the same angle but in an opposite direction. The inside surface 8 of each ring comprises two faces meeting one another at an angle. In use, one face acts against the shaft via friction, and the other is inclined to it. The shaft is rotated by an electric motor 1, which causes the rolling ring transmission to transverse the shaft. A screw 11 and a resilient washer act upon a bearing mount of the centre ring, to cause the rings to clamp against the shaft.</p> |
